update not working for non-owner

[Bryon Lape]

I have a script that gets executed when a user checks in a file that
updates the file under the web area.  This lets developers keep their
copies separate from the web area.  It works great if the user is the
file owner, but if they are not, things go into CVS ok, but issuing the
update command does not work.  There are group write permissions on the
file.  If the target file is first deleted and an upate done, all is
well.